A/C Identification Label
Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.
Scheme 1
Overview Air Conditioner LAN Control System
The LAN (local area network) system consists of front air control, air mix door motor, intake door motor, and mode door motor.
A configuration of these components is shown in the diagram below.
Scheme 2
OPERATION
The front air control receives data from each of the sensors. It then sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
Scheme 3
Overview of Control system
The control system consists of input sensors, switches, the front air control and outputs.
The relationship of these components is shown in the diagram below
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Scheme 5
CAN Communication System Description
Refer to " CAN COMMUNICATION ".
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- Measure voltage between each terminal and body ground by following "front air control INSPECTION TABLE".
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Operational Check
The purpose of the operational check is to confirm that the system operates properly.
System Operation
The front air control receives data from each of the sensors. The front air control sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
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Scheme 21
The front air control receives data from each of the sensors. The amplifier sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
Scheme 22
Scheme 23
The intake door control determines intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When the front air control is set to DEFROST, or OFF, the front air control sets the intake door at the fresh position.
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SYSTEM DESCRIPTION
Front air control controls compressor operation by ambient temperature and signal from ECM.
COMPONENT DESCRIPTION
The sunload sensor is located on the right defroster grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the front air control.
Scheme 26
BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engaging and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.